Actually we have quite a few square and rectangular pole mounted single phase transformers around my area as well, but they are older. I would guess some are from the 50's and 60's era when the cases were painted black or green but I have seen a few painted grey which seemed the norm around the 70's, unless of course they were "rebuilts".
All 3-phase transformers remain rectangular, and I will try to get pix as well in the next few days as well.
A.D
Same around here, the original transformers here from the 50s were/all are rectangular. So are the three phase transformers, but Peco doesn't hang many of those around here anymore, instead using three separate transformers.
Ian A.
